TL;DR: Michigan recognizes prenuptial agreements by statute (MCL 557.28) and case law, most notably Rinvelt v. Rinvelt (1991). Michigan is an equitable-distribution state, so without a prenup a court divides marital property fairly but not always equally. Michigan recorded 20,491 divorces in 2023, according to the Michigan Department of Health and Human Services.

Congratulations on planning your Michigan wedding. Somewhere between the venue deposit and the guest list, the topic of a prenup may have come up, and if it has, you probably have questions about whether it holds any weight here and what it takes to do it right. That instinct to understand the ground rules is a good one.

A prenup is a planning tool. It lets you and your partner decide together how you want to handle money, property, and expectations, with full information and time to think it through, rather than leaving those calls to a court's default rules later. And Michigan sees plenty of couples who end up relying on those defaults: the Michigan Department of Health and Human Services recorded 20,491 divorces in the state in 2023. A prenup does not assume that outcome. It gives you a say in the terms either way.

Here is what couples in Michigan should know before signing.

Are prenups valid in Michigan?

Yes. Michigan has authorized prenuptial agreements by statute since 1981 under MCL 557.28, which states that a contract relating to property made between people in contemplation of marriage remains in full force after the marriage takes place. That statute is the legal backbone for every Michigan prenup.

For years, one open question was whether a prenup that governed property division in a divorce (as opposed to on death) would hold up. The Michigan Court of Appeals settled that in 1991. In Rinvelt v. Rinvelt, 190 Mich App 372 (1991), the court held that prenuptial agreements governing property division in divorce are enforceable in Michigan, and it laid out the framework courts still use to evaluate them.

So the short version: prenups are legal, they are enforceable in divorce, and Michigan courts have decades of guidance on how to review them. What matters is whether yours is built to meet the standard.

What Michigan courts look at (the Rinvelt factors)

When someone challenges a prenup in Michigan, a court does not rubber-stamp it, and it does not throw it out on a whim. It works through a three-part fairness test that comes from Rinvelt v. Rinvelt. Understanding these factors up front is the best way to build an agreement that stands.

The first factor is voluntariness. The court asks whether the agreement was obtained through fraud, duress, mistake, misrepresentation, or nondisclosure. In plain terms: did both partners enter into it freely, with a full picture of each other's finances? The second is unconscionability, meaning whether the agreement was so one-sided or unfair at the time it was signed that a court should not enforce it. The third is changed circumstances: whether facts have shifted so dramatically since signing that enforcing the original terms would now be unfair and unreasonable.

One detail works in favor of a well-made agreement. The burden of proof sits with the person challenging the prenup, not the person relying on it. If your agreement was voluntary, fully disclosed, and reasonable when signed, the challenger has to prove otherwise.

Factor What the court asks How to protect against it
Voluntariness / consent Was the agreement obtained through fraud, duress, mistake, misrepresentation, or nondisclosure? Sign well before the wedding; disclose fully; avoid pressure.
Unconscionability Was the agreement unconscionable when it was signed? Keep terms reasonable and balanced; use independent review.
Changed circumstances Have facts changed so much that enforcement is now unfair and unreasonable? Revisit and update the agreement as life changes.
Burden of proof Who has to prove the agreement is invalid? The party challenging it carries the burden.

Michigan is an equitable-distribution state

If a couple divorces in Michigan without a prenup, state law decides how their property is divided. Michigan follows equitable distribution, the rule that a court divides marital property fairly based on the circumstances of the marriage. Fair does not mean automatic. Michigan is not a community property state where assets acquired during the marriage are split down the middle, and "equitable" does not always mean "equal."

Michigan courts weigh a range of factors when dividing property, including the length of the marriage, each partner's contributions, and their needs and circumstances. That gives a judge real discretion. You can read more about what happens if you don't have a prenup and about how community property differs from separate property if you want the fuller picture of the default rules.

The point of a prenup here is straightforward. It lets you and your partner set your own terms in advance instead of relying on a judge's later assessment of what is fair. You define what counts as separate, how appreciation is treated, and what happens to specific assets, on your terms rather than the court's.

What a Michigan prenup can and cannot cover

A Michigan prenup can do a lot. It can address how you divide separate and marital property, assign responsibility for premarital and marital debts, and it can go further where the finances are genuinely complex, and set spousal support terms (subject to the court's fairness review). It can also spell out how you want to treat things like the appreciation of an asset, a business one partner owns, or an inheritance either of you might receive.

There are limits, and they exist for good reason. A prenup cannot control child custody or child support; those decisions belong to the court and are based on the child's best interests at the time, not on terms set years earlier. It also cannot include terms that are unconscionable when signed, and it cannot contain anything that violates Michigan public policy.

Can typically address Cannot control
Division of separate and marital property Child custody decisions
Responsibility for premarital and marital debts Child support obligations
Spousal support terms (subject to fairness review) Terms that are unconscionable when signed
Treatment of appreciation, businesses, and inheritances Anything that violates Michigan public policy

There is one more guardrail worth knowing about, and it is a narrow one. In Allard v. Allard, the Michigan Court of Appeals recognized that a court retains the ability to reach separate property when strictly enforcing a prenup would leave one spouse destitute. This is a backstop against extreme unfairness, not a reason to distrust prenups. A well-drafted, balanced agreement that discloses assets and treats both partners reasonably is designed to hold up, and this limit rarely comes into play when the terms are fair to begin with.

How to get a prenup in Michigan (and what it costs)

Hourly rateTypical total for the couple
Michigan average, all practice areas$297–
Michigan family law attorneys$225 to $310–
Detroit area, at the upper end of that range$310–
Two Detroit-area attorneys hired separately–$2,700 to $9,000
First Lawyer ReviewFlat fee$3,500, both attorneys included
First Self-ServeFlat fee$649

Rates from the Clio 2025 Legal Trends Report and published Michigan family law rate data. Couple totals are computed from Detroit-area rates. Reviewed August 2026.

The mechanics are less complicated than most couples expect. A Michigan prenup must be in writing and signed to be valid. It does not need to be filed with any court; it stays a private contract between the two of you. Notarization is not strictly required by statute, but it is a common best practice that helps confirm the signatures were authentic and voluntary.

Timing matters more than any single formality. Michigan does not impose a fixed waiting period, but signing well before the wedding is one of the strongest protections you have. Rushing an agreement into the final days before the ceremony can support a later claim of duress, which is why many couples start the conversation several months out. That leaves room for full financial disclosure and for each partner to review the terms without pressure. If you want to think through timing in more detail, see our guide on the best time to get a prenup.

Independent legal review is another strong protection. Michigan does not require each partner to have their own attorney, but when both partners review the agreement with separate counsel, it reinforces that the agreement was voluntary and fully understood. That makes a later challenge based on duress or confusion much harder to sustain. Here is why two separate attorneys is the standard advice.

Cost varies with complexity. A short agreement between two people with straightforward finances takes less work than one involving a business, multiple properties, or blended-family considerations. Traditional attorney-drafted prenups are typically billed hourly, so the total depends on how much back and forth is involved. Our overview of how much a prenup costs walks through what drives the price.

This is where a modern path comes in. No stacks of PDFs, no open-ended hourly bills, no scheduling a series of in-person meetings. It is worth knowing what a local attorney actually charges for before you compare, and how the online options differ from each other. First offers a fully digital way to build a Michigan prenup on your own timeline, with independent legal review available when you want it.

One note on where Michigan law is heading. Michigan has not adopted the Uniform Premarital Agreement Act, the model law that standardizes prenup rules and has been adopted by 29 states plus the District of Columbia, according to the Uniform Law Commission. That could change. Senate Bill 160, which would enact a Michigan version of the Uniform Premarital and Marital Agreements Act, passed the Michigan Senate in May 2025, according to the Michigan Senate Fiscal Agency analysis. Because the law includes evolving elements, it is worth confirming the current requirements with a Michigan attorney before you sign. For a broader view of how rules differ across the country, see our state-by-state guide.

If you and your partner ever want to formalize financial terms after you are already married, that is a separate legal instrument, and the right step is to consult independent legal counsel about a postnuptial agreement.

Frequently asked questions

Are prenuptial agreements legal in Michigan?

Yes. Michigan has authorized prenuptial agreements by statute since 1981 under MCL 557.28, and the 1991 Rinvelt v. Rinvelt decision confirmed they are enforceable in divorce, not only on death. Courts uphold them when they are voluntary, fully disclosed, and not unconscionable when signed.

What makes a prenup unenforceable in Michigan?

A Michigan court may refuse to enforce a prenup if it was signed involuntarily or under duress, obtained through fraud or nondisclosure, unconscionable when executed, or if circumstances changed so much that enforcement would be unfair. The person challenging the agreement carries the burden of proof.

Does Michigan follow community property rules?

No. Michigan is an equitable-distribution state, meaning a court divides marital property fairly based on the circumstances, which is not always a 50/50 split. A prenup lets a couple set their own terms instead of relying on a judge's assessment of what is equitable.

Do both partners need their own lawyer for a Michigan prenup?

Independent counsel is not strictly required in Michigan, but having each partner review the agreement with their own attorney strengthens the case that it was voluntary and fully understood. This reduces the risk of a later challenge based on duress or lack of understanding.

How long before the wedding should we sign a prenup in Michigan?

Michigan does not set a fixed waiting period, but signing well before the wedding helps. Rushing an agreement into the days before the ceremony can support a later claim of duress, so many couples start the conversation several months out to allow time for disclosure and review.

Does a Michigan prenup have to be notarized or filed with a court?

A Michigan prenup must be in writing and signed to be valid, and notarization is a common best practice. It does not need to be filed with any court; it is a private contract the couple keeps for themselves.

Getting started with confidence

See what a Michigan prenup costs with First. If you are planning a wedding in Michigan, a prenup can be a practical way to align on money and protect what matters to each of you. It is a conversation about your shared plans as much as a legal document, and starting it early gives you the time and clarity that make an agreement strong. When you are ready, you can start with First, on your own timeline, with independent legal review available.

First is not a law firm. The information and tools provided by First on this site are not legal advice and not a substitute for the advice of an attorney.

Michigan prenup law includes evolving elements, including the pending SB 160 / UPMAA legislation, so confirm current requirements with a Michigan attorney. Enforceability depends on the specific facts of your situation and is decided by a court on a case-by-case basis.

Methodology

The divorce figures in this post are drawn from the Michigan Department of Health and Human Services Division of Vital Records and Health Statistics, covering calendar year 2023, based on divorce records filed statewide. The legislative status for Senate Bill 160 reflects Michigan Legislature records as of the 2025-2026 session and should be re-verified at publication.

Sources